Desert Region for Morrowind took place north of the main island of Vvardenfell. There were lots to do there, especially with side quests. Most of it was pretty easy (for me anyway, this mod requires at least a Level 30 for some of the harder quests).
But after Desert Region, I decided to release the sequel. It took place in the Ashes of Apocalypse world, and technically it's more serious than the first one. Desert Region 2 adds a small amount of land, most of them being small islands. There was only 1 side-quest involved (getting Ashley Wood a husband) and collecting orbs was less fun than the previous one. The intended amount of orbs were 12,000 but then I decided to narrow it down to 2,026. I plan to put the final ending to the mod in the start of February 2009, with 4 more orbs in place.
Desert Region 3 will take place in a different game: Half-Life. It's the first of the Desert Region series to exist in another game other than Morrowind. But since, I have now put the ending to Desert Region 2, I can't say much about what will be planned in the third one for the moment, only that it will take place mostly in an expanded desert. I plan to start working on Desert Region 3 in Feb-March 2009 and I will put a profile of the mod when I at least have done 2% of the final release. The actual final release is unknown, I'm afraid. I estimate that it might be released in late 2009, but I'm not sure.